condition mean min max ZT0-3 9.838767 9.838767 9.838767 ZT4-7 9.261149499999998 9.261149499999998 9.261149499999998 ZT8-11 8.858849500000002 8.858849500000002 8.858849500000002 ZT12-15 9.6943505 9.6943505 9.6943505 ZT16-19 9.720547 9.720547 9.720547 ZT20-23 10.844348499999999 10.844348499999999 10.844348499999999